In my backyard last year I seeded some common bermuda to see how well it would do while I had fescue in the front. Last year I mowed at about 2" and this year after the winter rye died I've been mowing the section of bermuda at 1" with my rotary mower and mowing every 4th day. I mowed again yesterday @ 1" and I can say that the bermuda looks more dense and also green with just rain water (no irrigation and not dragging hoses). My dad has seeded bermuda but he mows his above 2" because he thinks its going to die in the hot sun and his is more weed prone(a lot of crabgrass has started coming up in the last month). I keep telling him to drop the deck lower.